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I also have a Surge Guard portable unit that I use - until I figure out if I need an autoformer (built in surge protector). The portable unit has tripped during my use from low voltage (it cuts off to protect).
From what I have seen so far, most of the campground power mast boxes also have a locking covers. All you need is a padlock. They would have to cut the cover it to get it (easy). With the connector lock (I also have one) they would have to cut the main cord.
Like Orv said, It comes down to keeping people honest - if they want it, they'll get it.
With an autoformer inside, all they can get is the outside cord for copper.
For my purposes, tripping on low voltage is fine (even desirable), but if I'm away to town I would want it to restart by itself. I have a dog that would be inside and don't want to worry about the air going off while we're away.
Ozz's suggestion is cheaper and pretty easy to do too...and better than the external surge protector. I think this will be on my short list.
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